juko | 65c4b137bafe4aa0381958faaea9c1834104d7c46d20a3bc58b7f7917d1913ec

General

Target
2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe
Size 53KB
Sample260504-kr7bfse12x
SHA256 65c4b137bafe4aa0381958faaea9c1834104d7c46d20a3bc58b7f7917d1913ec
MD5 3109e6316c46a24a1990d695a85b030e
SHA1 4a6750d0853d5b55f38d75f7b6a16919ce823a68
SHA512 9f8db096ca8896e38c4fcf6b1701ba9a2252627dee850163f6308ec70ac1c3d544f3f9f017753003f6e33202d3bd90c610d37c7424c68f00084d8bf4390094ce
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2h:3Ly2Kerc64CiGIm1tcBMUOOFh
TLSH
T1A6335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral1/files/0x000b00000002166e-4.dat	family_juko
behavioral1/files/0x0008000000024430-14.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5612	WINWORD.exe
5364	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3368	cmd.exe
5744	PING.EXE
3536	PING.EXE
5604	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5744	PING.EXE
3536	PING.EXE
5604	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4996 wrote to memory of 5612	4996	2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe	85
PID 5612 wrote to memory of 3368	5612	WINWORD.exe	87
PID 3368 wrote to memory of 5744	3368	cmd.exe	89
PID 3368 wrote to memory of 3536	3368	cmd.exe	90
PID 3368 wrote to memory of 5604	3368	cmd.exe	93
PID 3368 wrote to memory of 5364	3368	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4996
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5612
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00002D49" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3368
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5744
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3536
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5604
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:5364

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002D49

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002D49
Size 53KB
SHA256 a210883a1587b57b7a8891f38fb1ffce307e3d82e66b1cff9186e5d088a18a01
MD5 8ca536b8dd02ac9918a79a12ef1a91c1
SHA1 724b6cb7d8f2f18e758470a716b9c216a5e0e56d
SHA512 11dd4410fed761bbd7dc7fb3a16fe1b86fc2753b0f2f91edb183b7fe9e17f6f45d7441add21f82a860e1fba276324296b994579d59d44ae952c5747837f44e2c
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2/:3Ly2Kerc64CiGIm1tcBMUOOF/
TLSH
T18E335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 65c4b137bafe4aa0381958faaea9c1834104d7c46d20a3bc58b7f7917d1913ec
MD5 3109e6316c46a24a1990d695a85b030e
SHA1 4a6750d0853d5b55f38d75f7b6a16919ce823a68
SHA512 9f8db096ca8896e38c4fcf6b1701ba9a2252627dee850163f6308ec70ac1c3d544f3f9f017753003f6e33202d3bd90c610d37c7424c68f00084d8bf4390094ce
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2h:3Ly2Kerc64CiGIm1tcBMUOOFh
TLSH
T1A6335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4996-11-0x00000000001C0000-0x00000000001C6000-memory.dmp

Download

memory/5364-16-0x0000000000530000-0x0000000000536000-memory.dmp

Download

memory/5612-13-0x00000000001C0000-0x00000000001C6000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads